P1 helps to compensate the regulator operating quiescent current consumption value, which results in a minor negative deviation across their voltage range, which is in turn effectively compensated by P3. Wouldn’t be able to measure low voltages very well if I used the panel itself in place of a battery. I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. *** The proposed digital voltmeter, ammeter circuit module can be effectively used with a power supply for indicating the voltage and current consumption by the connected load through the attached modules. Mentioning it just in case. Your email address will not be published. I’ve tried your method for the “Red, black and yellow thick wires + red and black thin wires” setup and it works perfectly. The usage of digital voltmeter has increased the speed and accuracy with which the readings are noted. The transistors are BC640, however you may try other transistors like 8550 or 187 etc. Hi Gokul, I am not good with Arduino, so solving an Arduino related query can be difficult for me! Also important! 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Privacy Policy They are basically the same. Required fields are marked *. | Suppliers Thanks! batteries, power supplies). An interesting and accurate digital voltmeter and ammeter circuit has been explained in the present article which can be easily built at home, however the unit will require a well designed PCB for the sake of accuracy and perfection. t pretty much the same meter today (also waiting for several weeks :D) and at first, the wires looked a bit confusing. | Thanks for this…wouldn’t have thought the thin wires are just a powHi! The circuit employs IC 3161 and 3162 for the required processing of the input voltage and current levels. Sorry, but we can't respond to individual comments.If you need immediate assistance, please contact Customer Care. In this article we learn how to build a digital voltmeter and a digital ammeter combined circuit module for measuring DC volts and current through different ranges, digitally. Sorry Rikseng, I don’t have the design with me at this moment…. That is correct. For example, I have used it to measure the output of my DIY solar panel. Hola Manuel, sí, puedes usar este circuito con la fuente especificada, sin embargo, ten en cuenta que este circuito no fue diseñado por mí sino que fue tomado de la revista elektor electronics. That small bridge bent from a thick wire on PCB. HIGH ACCURACY AND STABLE WORKING PERFORMANCE - Shopcorp Digital Led Display Indicator Voltmeter and Ammeter eliminates human errors, offering accurate and fast readings compared to analogue meters. Get it as soon as Wed, Nov 4. Unfortunately, I didn’t find any good resource about how to wire/connect it. FREE Shipping on your first order shipped by Amazon. Thank you Paul. Not sure why, but it seems that they have common ground and input line expects only negative/GND for measuring. When you say “Black wire (ground) is not needed. Thank you for posting the wiring diagram; I need it! Lazada, Browse Alphabetically: The third thick wire is obviously used to measure battery voltage of the circuit, but which wire should this be? But then you can only use a maximum of 30V since it’s the maximum operating voltage for the meter itself. It works like a charm! Hi Janar, Used as a voltmeter, a digital meter is usually better because its resistance is much higher, 1 MΩ or 10 MΩ, compared to 200 Ω for a analog multimeter on a similar range. As you said values R3 or 2 ohm/2w used same then also same its taking above 3hours for charging even without resistor also same problem when normal charging from AC charger it will take around 2hr only, so please gave me the circuit diagram which is working like AC charger and my mail id ssinnurs@gmail.com Even I am following urs all blogs past 10 months it become very helpful. I have resetted (jumping 2 pins on the PCB) and now it remains at 0.0..0.1A. But this meter is rated to measure up to 100V. Thank you. Can you explain that? Some panels I have only go to max 20 volts or so on Voc, but others go right on up to 50 volts (in summer) or even up to 55 volts (at 40 below zero in the winter). Your picture shows 2 power sources (I think) in that you have the small red and small black going to a 9v battery and the small yellow in that bundle going to the power supply positive but the pictures is not clear. Expected delivery is 10-15 days. Also when measuring current that exceeds 10A which can be handled with the internal one. With this switch set for measuring voltage P4 along with R1 provides an attenuation of around 100 for the fed input voltage. I don’t need the meter to work in reverse. How can I wire these kind of voltage/current meters?? Any suggestions please? Yes, the instrument I’ll buy has a build-in shunt, as you mention in the second sentence of your article. I am not good with microcontrollers so I am sorry I won't be able to help you.

Rani, you can connect the battery directly with the smart phone charging input but make sure to attach a 6V/1amp flashlight bulb in series with the positive line of the battery. If there is none- this guide is not for you.

I tried this on the first one in the list. Unfortunately, I don’t know by heart how these other meters show. If someone has some other info please let me know.

I saw one place that said green was voltage detection but when I tried on a battery it sparked and meter went dark. Hi.

I presume the thick Black and Red wires are to be put in-line with a flowing current, Red wire to + source, and Black to – direction. In France all suplyers consider these components OBSOLETE it’s very shame!! Otherwise, there would be nothing to measure. Besides, all of our products have been strictly inspected before shipment, Universal DC 9V to 48V 10A Digital Voltmeter Ammeter Voltage Current Meter Measurement LED Display For motorcycle Electric bike, PZEM DC 0-200V 300A Voltmeter Ammeter Car Battery Tester Capacity resistance electricity Voltage Meter 12v 24v 48v 96v, Installation deept is 65mm only digital ammeter and voltmeter, Led Display Digital Ammeter And Voltmeter, Waterproof Mini Round Digital Voltmeter And Ammeter socket For Car Bus Marine, Alibaba.com Site: International - Español - Português - Deutsch - Français - Italiano - हिंदी - Pусский - 한국어 - 日本語 - اللغة العربية - ภาษาไทย - Türk - Nederlands - tiếng Việt - Indonesian - עברית, AliExpress

The heart of the Voltmeter Ammeter is PIC16F876A microcontroller with built-in analog to digital converters (ADC) and 2×16 green / blue backlighted LCD display. I want to use a 24 vdc amp meter for my elect train layout, the problem I’m having is how to hook up the meter so I can reverse the polarity having the train run in reverse. Again, thank you very much for the detailed article and the fine clarification. Be aware, although, that the highest possible V reading in that case turns into 20.0 V (R6 declines l V max. Look up Kirchoff’s law and it will all make sense.

In this case is in series still but on the negative side?! I connected up as per your diagram. Waterproof Battery Meter 12V DC Voltmeter LED Digital Display Voltage Gauge Battery Tester for … It shorted out. Fat and thin red wires go together and also thin yellow wire.

They are inexpensive and easy to connect. My dual digital voltameter has red, black and green thick wires (not the thin red and black to power the display). I have a 100v/10A DSN-VC288. I made a quick test on opening the packet, using a 9V battery connected with the small black wire connected to negative side and the red one to the positive. i think shorted, not reversed. i don’t want to read the load ampere

100V / 10A DC volt- and ammeters with differently colored wires. I just got a couple of V&A meters with Blue Volts and Red Amps on the picture of the display. Later when in service with a grid tie micro-inverter I can look at the Vmpp and Impp as the sunlight changes angle or clouds roll in. So if you are measuring voltages over 30V you should power this meter with external power with less than 30V. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this. Chinese supplier unable to provide any advice or technical data. i just wan to read the rest ampere left in my battery As you can see I have included 3 different types of meters here. In my situation the power supply and the load to be read are one and the same, ie the 2 rails of the track. They all can be wired such way that you don’t need a separate power supply for the electronics part. Thankyou Janar!

Now,for the fun and me be by nostalgie i want to build again 2 modules on base of your circuit Volt/Amp mesures,but the first problém is: WHERE can i buy 2 sets of this couple of IC?

I’m sure that’s fine at small loads, but I can’t imagine that would be good when you get into the amps. 2) Correct @ 4.5V.

Red connects to terminal on the display labelled “Vi+”, black to “COM” and green to “I+”, but I have no idea what these mean and they don’t match the incorrect wiring diagram shown on the suppliers ebay page which refers to thick red and black and thin yellow wires.

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